coreboot-kgpe-d16/util/xcompile/xcompile

#!/bin/bash
#
# This file is part of the coreboot project.
#
# Copyright (C) 2007-2010 coresystems GmbH
# Copyright (C) 2012 Google Inc
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#

TMPFILE=""
XGCCPATH=${1:-"`pwd`/util/crossgcc/xgcc/bin/"}

die() {
	echo "ERROR: $*" >&2
	exit 1
}

clean_up() {
	if [ -n "$TMPFILE" ]; then
		rm -f "$TMPFILE" "$TMPFILE.c" "$TMPFILE.o"
	fi
}

# Create temporary file(s).
TMPFILE="$(mktemp /tmp/temp.XXXX 2>/dev/null || echo /tmp/temp.78gOIUGz)"
touch "$TMPFILE"
trap clean_up EXIT


program_exists() {
	type "$1" >/dev/null 2>&1
}


if [ "$(${XGCCPATH}/iasl 2>/dev/null | grep -c ACPI)" -gt 0 ]; then
	IASL=${XGCCPATH}iasl
elif [ "$(iasl 2>/dev/null | grep -c ACPI)" -gt 0 ]; then
	IASL=iasl
else
	die "no iasl found"
fi

if program_exists gcc; then
	HOSTCC=gcc
elif program_exists cc; then
	HOSTCC=cc
else
	die "no host compiler found"
fi

cat <<EOF
# platform agnostic and host tools
IASL:=${IASL}
HOSTCC:=${HOSTCC}

EOF

testcc() {
	local tmp_c="$TMPFILE.c"
	local tmp_o="$TMPFILE.o"
	rm -f "$tmp_c" "$tmp_o"
	echo "void _start(void) {}" >"$tmp_c"
	"$1" -nostdlib -Werror $2 "$tmp_c" -o "$tmp_o" >/dev/null 2>&1
}

testas() {
	local gccprefixes="$1"
	local twidth="$2"
	local arch="$3"
	local use_dash_twidth="$4"
	local obj_file="$TMPFILE.o"
	local full_arch="elf$twidth-$arch"

	rm -f "$obj_file"
	[ -n "$use_dash_twidth" ] && use_dash_twidth="--$twidth"
	${gccprefixes}as $use_dash_twidth -o "$obj_file" $TMPFILE 2>/dev/null ||
		return 1

	# Check output content type.
	local obj_type="$(${gccprefixes}objdump -p $obj_file)"
	local obj_arch="$(expr "$obj_type" : '.*format \(.[a-z0-9-]*\)')"
	[ "$obj_arch" = "$full_arch" ] || return 1

	# Architecture matched.
	GCCPREFIX="$gccprefixes"

	if [ -z "$use_dash_twidth" ]; then
		ASFLAGS=""
		CFLAGS=""
		LDFLAGS=""
	else
		ASFLAGS="--$twidth"
		CFLAGS="-m$twidth"
		LDFLAGS="-b $full_arch"

	fi

	# Special parameters only available in dash_twidth mode.
	[ -n "$use_dash_twidth" ] && case "$full_arch" in
		"elf32-i386" )
			LDFLAGS="$LDFLAGS -melf_i386"
			CFLAGS="$CFLAGS -Wl,-b,elf32-i386 -Wl,-melf_i386"
			;;
	esac

	return 0
}

detect_special_flags() {
	local architecture="$1"
	# GCC 4.6 is much more picky about unused variables.
	# Turn off it's warnings for now:
	testcc "$CC"   "$CFLAGS -Wno-unused-but-set-variable " &&
		CFLAGS="$CFLAGS -Wno-unused-but-set-variable "

	# Use bfd linker instead of gold if available:
	testcc "$CC"   "$CFLAGS -fuse-ld=bfd" &&
		CFLAGS="$CFLAGS -fuse-ld=bfd" && LINKER_SUFFIX='.bfd'

	testcc "$CC"   "$CFLAGS -fno-stack-protector"&&
		CFLAGS="$CFLAGS -fno-stack-protector"
	testcc "$CC"   "$CFLAGS -Wl,--build-id=none" &&
		CFLAGS="$CFLAGS -Wl,--build-id=none"

	case "$architecture" in
	x86)
		testcc "$CC"   "$CFLAGS -Wa,--divide" &&
			CFLAGS="$CFLAGS -Wa,--divide"
		;;
	esac
}

report_arch_toolchain() {
	cat <<EOF
# elf${TWIDTH}-${TBFDARCH} toolchain (${GCCPREFIX}gcc)
CC_${TARCH}:=${GCCPREFIX}gcc
CFLAGS_${TARCH}:=${CFLAGS}
CPP_${TARCH}:=${GCCPREFIX}cpp
AS_${TARCH}:=${GCCPREFIX}as ${ASFLAGS}
LD_${TARCH}:=${GCCPREFIX}ld${LINKER_SUFFIX} ${LDFLAGS}
NM_${TARCH}:=${GCCPREFIX}nm
OBJCOPY_${TARCH}:=${GCCPREFIX}objcopy
OBJDUMP_${TARCH}:=${GCCPREFIX}objdump
READELF_${TARCH}:=${GCCPREFIX}readelf
STRIP_${TARCH}:=${GCCPREFIX}strip
AR_${TARCH}:=${GCCPREFIX}ar

EOF
}

# Architecture definition
SUPPORTED_ARCHITECTURE="x86 armv7 aarch64"

arch_config_armv7() {
	TARCH="armv7"
	TBFDARCH="littlearm"
	TCLIST="armv7a armv7-a"
	TWIDTH="32"
	TABI="eabi"
}

arch_config_aarch64() {
	TARCH="aarch64"
	TBFDARCH="littleaarch64"
	TCLIST="aarch64"
	TWIDTH="64"
	TABI="eabi"
}

arch_config_x86() {
	TARCH="x86_32"
	TBFDARCH="i386"
	TCLIST="i386 x86_64"
	TWIDTH="32"
	TABI="elf"
}

test_architecture() {
	architecture=$1

	GCCPREFIX="invalid"
	if type arch_config_$architecture > /dev/null; then
		arch_config_$architecture
	else
		die "no architecture definition for $architecture"
	fi

	# To override toolchain, define CROSS_COMPILE_$arch or CROSS_COMPILE as
	# environment variable.
	# Ex: CROSS_COMPILE_arm="armv7a-cros-linux-gnueabi-"
	#     CROSS_COMPILE_x86="i686-pc-linux-gnu-"
	search="$(eval echo \$CROSS_COMPILE_$architecture 2>/dev/null)"
	search="$search $CROSS_COMPILE"
	for toolchain in $TCLIST; do
		search="$search $XGCCPATH$toolchain-$TABI-"
		search="$search $toolchain-$TABI-"
		search="$search $toolchain-linux-gnu-"
	done
	echo "# $architecture TARCH_SEARCH=$search"

	# Search toolchain by checking assembler capability.
	for gccprefixes in $search ""; do
		program_exists "${gccprefixes}as" || continue
		testas "$gccprefixes" "$TWIDTH" "$TBFDARCH" "" && break
		testas "$gccprefixes" "$TWIDTH" "$TBFDARCH" "TRUE" && break
	done

	if [ "$GCCPREFIX" = "invalid" ]; then
		echo "Warning: no suitable GCC for $architecture." >&2
		continue
	fi
	CC="${GCCPREFIX}"gcc

	detect_special_flags "$architecture"
	report_arch_toolchain
}

# This loops over all supported architectures.
for architecture in $SUPPORTED_ARCHITECTURE; do
	test_architecture $architecture
done